It's no longer necessary since https://bugzilla.mozilla.org/show_bug.cgi?id=1305963 is fixed quite some time ago. While we're here, mark the `cachedGetSinglePixelWidth` member as being private and use ES6 syntax in the `getSinglePixelWidth` method.
It's no longer necessary since https://bugzilla.mozilla.org/show_bug.cgi?id=1305963 is fixed quite some time ago. While we're here, mark the `cachedGetSinglePixelWidth` member as being private and use ES6 syntax in the `getSinglePixelWidth` method.